Crimes are mainly committed by the young, and for this reason merely increasing the number of police officers or expenditures on police services has little effect on reducing the crime rate. In fact, the only factor associated with a crimerate drop is a decrease in the number of People in the community aged fourteen to thirty.
The findings above can best serve as part of an argument against
A．the likelihood that any law enforcement program will be effective in reducing the crime rate within a short time.
B．increasing prison terms for young people found guilty of crimes.
C．introducing compulsory military conscription for people aged seventeen to nineteen.
D．raising the age at which students are permitted to leave school.
E．(E) a community’s plan to increase the number of recreational and educational activities in which young adults can participate.
参考答案：A
解析： 本题问题目的是上述发现能够驳斥下面哪一个，一般是把段落中的main idea取非即为答案。上面段落里的“the only factor...”取非，即(A)表明任何方案都可能只在短期内有效，所以与上面推理相违背，因此(A)正确；(E)易误选，选(E)的人认为娱乐、教育增加可以减少犯罪，从而反对了上面的“the only factor...”，但这是递推出来的，实际上(E)与犯罪率减少一点关系也没有，因此(E)不正确。